Surface Caves Don't Connect A Lot With New Caves

I went around exploring on the surface to check out what the new caves are like, however it seems a lot of the surface level caves are the same and only rarely seem to connect to the big caves that are deeper.  However this seems to apply more to the caves that are on land, the water ones seem to connect deeper a bit more.  I don't think this is good as it means it takes a lot more time to actually get to the new caves to explore and start caving for resources, or you just have to mine around and hope you get lucky in finding a new cave.  I think this should be changed so surface caves, both the underwater ones and the normal on land ones, connect to these deeper cooler caves more often then they do currently.